Wahyuni, et al. “PENGUKURAN ANISOTROPI MAGNETIK SUSCEPTIBILITY BATUAN VULKANIK GUNUNG MERAPI DI JAWA TENGAH”. Jurnal Sains Materi Indonesia, vol. 3, no. 2, Feb. 2002, pp. 75-78, doi:10.17146/jusami.2002.3.2.5240.